Cartrack ******** clients to up their numbers!!!!!!

on the 3rd of july 2021 i sent a cancellation form to cartrack to cancel my contract after i had a converstion with one of the consultants named Sandiswa chabalala from Accounts department, she had informed me that i need to pay up an amount of R1592.66 first before they can cancel my contact with car track. i asked her to load a stop order for that amount to go off on the 20/08/2021. the payment went through successfully and on the 17/08/2021 i had already received proof of cancellation of my contract with cartrack. on the 15th of February 2022 a debit went through my account and bounced from car track and i was charged R115. on the 16th February 2022 i called cartrack and spoke to a simphiwe from accounts who said to me i am owing cartrack, my question is how do i owe while my contract is cancelled? he said i was owing before cancellation of my contract, my second question was how? because i was told a settlement amount by sandiswa which i paid in full then my contract was cancelled. cartrack is a **** and trying all means to keep customer forcefully this way. i want cartrack to cancel the debit that is going through my account monthly as i have proof that i cancelled my contract with them. i have no business with them. simphiwe was very rude that he placed me on hold for 30 minutes until i hung up waiting for a manager.